Developing device



June 11, 1940.

K. LANGE 2,203,963

DEVELOPING DEVICE Filed Sept. 15, 1938 2 Sheets-Sheet '1 Inm 7 s $1.4M:

June 11, 1940. LANGE DEVELOPING DEVICE Filed Sept. 15, 1938 2 Sheets-Sheet 2 In yen f r fi/fi'r 4414/1 65, 5' y:

Alforney.

Patented June 11, 1940 UNITED STATES PATENT OFFICE Application September 15,

In Germany 7 Claims.

This invention relates to a device for developing photographic image strips in daylight.

It is an object of my invention to provide an apparatus for developing in daylight photographic strips consisting of paper, Celluloid, cellulose derivatives or any other material.

Another object of my invention is to provide an apparatus for developing in daylight photographic strips taken by means of any type of camera of other photographic exposure means, as for example, an oscillograph.

A special object of the invention is to render it possible to develop immediately and without a dark room, the photographic strips exposed in an oscillograph, for example, by a doctor who has taken the electrocardiogram of a patient and wants to make his decisions immediately at the bed of the patient, according to the results of the electrocardiogram.

With these and further objects in view as may become apparent from the following disclosures, the invention consists not only of the structures herein pointed out and illustrated by the drawings but comprises further structures as hereinafter claimed.

The character of the invention, however. may be best understood by reference to certain of its structural forms, as illustrated by the accompanying drawings in whicha Fig. 1 is a partial vertical section on line I-I in Fig. 2, of one embodiment of the invention.

Fig. 2 is a partial horizontal section on line IIII in Fig. 1.

Fig. 3 is a vertical section showing a further embodiment of the invention.

Figs. 4 to 6 show in partial plan views, various examples of packings to be used in connection with my device, viz- Fig. 4 shows a type comprising a flap,

Fig. 5 a cock type packing and Fig. 6 a packing formed by a cap which can be attached and detached.

Fig. 7 is a horizontal section of a further embodiment, showing a magazine or dark container formed as a developing box and Fig. 8 is a horizontal section of an embodiment differentiated from Fig. 1 in that the feeding slot for the spacer strip is arranged at the dark container.

Similar reference numerals denote similar parts throughout the different figures.

Referring now to the drawings in greater detail, and first to Figs. 1 and 2, the photographic strip ii of film material, paper or the like is wound up or stored otherwise in the magazine or described.

1938, Serial No. 230,137

October 30, 1937 dark container I having a cover I from which it is to be transferred into the developing box or chamber 2, without being exposed to any light in the transferring operation. To this end slot shaped extensions 5 and 6 respectively are provided on the container I and box 2 in co-operative relationship, and a light-tight detachable joint I is formed between the two extensions. To this end, the extension 5 is formed with a sleeve 5' embracing extension 6 to form a labyrinth 10 packing, and a resilient collar 5", for example, of rubber is moreover provided between the inner face of extension 6 and extension 5.

The slot-shaped extension 6 is formed with a branch or side extension 9 through which a 15 spacer strip III may be introduced which consists, for example, of a band of Celluloid having about the same width as the photographic strip and provided near its edges with projections or corrugated portions for the purpose which will be 20 In order to prevent the light from entering through extension 8, the spacer strip I0 may be arranged in a magazine similar to magazine I and connected to the extension 9 in the same manner as the extension 5 of maga- 25 zine I.

The box 2 has a tubular central projection extending from its bottom towards the cover 8 of the box which is detachable and provided to form a labyrinth packing I1 by engagement with the suitably shaped upper edge of the box.

A bobbin II is mounted for rotation on the operated by the knob 4 promotion 3 and can be engaging the cross pin I9 of the bobbin by its slot 20, a labyrinth packing I8 again being provided between the bobbin I I and the cover 8, to prevent daylight or any other light from entering into the developing chamber.

The bobbin II may have a slot or other attaching means for the photographic strips to be 40 wound up on it, but preferably an auxiliary strip is fixedly secured to the cover of the bobbin for connection with the photographic and spacer, strips I6 and III by means of a clip or gripper I2.

The operation of the apparatus shown in Figs. 1 45 and 2 will now be described: In order to developthe photographic strip contained in the dark 0on1 tainer I which has been removed from the camera. the slot-shaped projections 5 and 6 of the containers I and 2 are light-tightly connected with 50 each other by the joint 1 in the manner described above and, after removal of the cover 8, the outer ends of the photographic strip I 6 and spacer strip III are drawn into the box 2 and attached to the clip I2. Now the cover 8 is again closed 55 and the strips It and I. are wound up together on the bobbin II by operation of knob 4. when the strips have been wound up completely on the bobbin II, the box 2 is separated from the container l and the slots 6 and 8 are closed lighttightiy and water-tightly by a seal or cap of rubber or other suitable material as will be described with reference to Figs. 4, 5 and 6. The photographic strip ll may now be developed in the developing box 2 under daylight, in the manner known per so, by filling in the developing substance through the center hole in the cover, after removal of the detachable knob 4. It will be understood that the developing substance will be admitted to the photographic strips through narrow channels existing in the labyrinth packing ll and/r between member 3 and bobbin II, and since the single convolutions oi the photographic strip are separated by the spacer strip, the developing substance can act also on the inner layers of strip Ii. After the developing process, the developing substance may be removed and replaced by a suitable fixative solution.

Various forms of seals for the slot extensions 6 and 9 in Figs. 1 and 2 are shown in Figs. 4 to 6.. According to Fig. 4, a kind oi. flap valve is provided comprising a flap la covered with a conical valve body of packing material and a valve seat lb of resilient material, for example, rubber. A locking device 25, 28 of any known type has been provided to retain the valve flap on its seat and to ensure a light-tight and liquid-tight seal. A similar seal has been provided for the slot-shaped extension 9, as indicated.

In this case, the extension 5 of the magazine I may be formed somewhat larger in its outer dimensions than the bore of the valve seat 112 and urged into said bore by means or a tapered front end, so as to ensure light-tight connection without requiring a labyrinth packing as in Fig. 2.

According to Fig. 6, a resilient detachable closure cap 28 has been provided instead of the flap 111 while for the rest the arrangement is the same as in Fig. 4.

In order to prevent the light from entering into box 2 during the short interval where the joint 5, 1, 6 is being separated and the fiap Ia or other seal is closed, the extension 6 in Figs. 2, 4 and 6 is constructed in the form of a relatively long and narrow, black channel which, moreover, may be provided with one or more strips or collars of velvet or the like in the manner known, for example, from dark slides.

Fig. 5 shows a construction in which a cock plug 21 is provided in the narrow channel between box 2 and extension 6, as a lightand liquid-tight seal for extension 6.

By way of an alternative, the channel 9 may be provided at the magazine I, as shown in Fig. 8. the arrangement being for the rest substantially the same as in Figs. 1 and 2.

Referring now to Fig. 3, the container l for the bobbin 16 carrying the photographic strip IS in this case is formed integral with the developing box 2 and the spacer strip I0 is also comprised in the same space, on a bobbin In. A common slot 22 is provided for introducing the strips i6 and II from the upper chamber l to the lower chamber 2 which may be filled with the developing substances through a funnel 23 and labyrinth-shaped channel 24. A lateral cover (not shown) is provided to close the combined chambers I and 2 light-tightly and liquidtightly after the bobbins I6 and II with the strips I. and II have beeninserted. A spool II is arranged in the chamber ll ior winding up the strips I. and ll alter the cover has been closed, by means or a knob (not shown), constructed similar to that shown in Fig. 1 and extending into the chamber 2 from the rear wall thereof, through a stuiling box or other liquid tight packing of known construction, for preventing the developing substance from flowing out. The bobbins II, II and II are placed on center pins or pivots It", II", II" iormed similar to the member I in Fig. 1 and secured to the rear wall oi the unit I, 2. A spout 29 which may be relatively long and narrow, with a black and corrugated or serpentine shaped inner surface to prevent the light from entering is provided for pouring out the developing. substance, whereafter the fixative may be filled in through funnel 23.

The embodiment shown in Fig. 3 has the advantage that no detachable joint and seal is required for the chambers I and 2, since the developing substance remains in the lower chamber 2 and cannot enter into the upper chamber I. On the other hand, special steps must be taken to provide a liquid-tight cover and stufling box.

Where it is possible to accommodate a magazine or dark container of sumcient size in the camera or other exposure means for the photographic strips, the magazine may itself form the developing chamber at the same time, such a construction being shown in Fig. 7 where l is the usual dark container or magazine which is accommodated in the photographic camera and provided with a bobbin II on which the photographic strip is wound up by action of gears 1|. 3| belonging to the mechanism of the photographic camera and acting by means of a disengageable coupling (not shown) upon the shaft 3 which in this case is rotatably mounted in the container l and provided with a stufling box or seal cap (not shown) to ensure a liquid-tight closure at the point where the opening for the coupling of the shaft 3 is provided in the side wall of the container.

Now, apart from the usual extension 6 of the magazine through which the photographic strip it enters after it has been exposed, a further extension 9 is provided for feeding the spacer strip II which is unwound from a separate bobbin (not shown) arranged in the photographic camera at a suitable point and gripped together with strip II, by the clip I! of strip 2|. Seal members similar to any of those shown in Figs. 4, 5 and 6 are provided for the apertures of the channels 5 and 9, to prevent light from entering into, and the developing substance from flowing out of, the magazine. A cover similar to cover I shown in Fig. 1 is provided for the magazine, and the developing substance may again be filled in in the same manner through a center hole of this cover.

I am aware that many changes may be made and numerous details of construction may be varied through a wide range without departing from the principles of this invention, and I, therefore, do not purpose limiting the patent granted hereon otherwise than is necessitated by the prior art.

I claim:

1. In a developing apparatus for developing photographic strips in daylight, comprising a magazine for receiving the wound up strip before development, a developing chamber, a detachable connection between the chamber and the magazine for transferring said photographic strip together with a spacer strip into said developing chamber without the admission of light, and means for preventing the developing substance from entering into said magazine after the strip has been transferred.

2. In a developing apparatus for developing photographic strips of paper and the like in daylight, comprising a magazine for reception of a bobbin and an undeveloped strip, a developing chamber, a detachable connection between the magazine and chamber, a bobbin in the developing chamber for winding up the strip, means for rotating the second bobbin from the outside of the developing chamber, a passage through the connection between the magazine and the cham ber for reception of the strip, and light and liquid sealing means in the passage adapted to prevent the developing substance in said chamber from entering into the magazine.

3. In a developing apparatus for developing photographic strips of paper and the like in daylight, comprising a magazine for reception 01 a bobbin with an undeveloped strip, a developing chamber, a bobbin in the developing chamber for winding up said strip, means for rotating said sec-- ond bobbin from the outside of the developing chamber, an extension on said magazine having a slot, an extension on said developing chamber having a slot, a light-tight detachable joint between said extensions and means for closing said second extension.

4. The structure of claim 3 in which the Joint includes a labyrinth packing.

5. The structure of claim 3 in which a packing is interposed between the extensions.

6. In a developing apparatus for developing photographic strips of paper and the like in daylight, comprising a magazine for a bobbin with an undeveloped strip, a developing chamber, a bobbin in the developing chamber for winding up said strip, means for rotating said second bobbin from outside of the chamber, an extension on said magazine having a slot, a pair of extensions on the developing chamber, each having a slot, a light-tight detachable joint between said first extension and one of said second extensions, means for transferring the photographic strip into said developing chamber through said joint, a spacer strip extended through the other of said second extensions, said spacer strip being detachably connected to the photographic strip, and means for closing said second extensions.

7. In a. developing apparatus for developing photographic strips in daylight comprising a magazine for reception of a bobbin, a developing chamber for reception of a bobbin, a slotted extension on the developing chamber, a slotted extension on the magazine, a light-tight coupling on the extension of the magazine complemental to the extension of the developing chamber and similarly complemental to a photographic camera when detached from the developing chamber,

KURT LANGE. 

